3486166-pass-metric-type | Add support for vector search time metric selection
Change to SearchApiAiBackend::doSearch() to include the metric type in active config to the vdb provider vectorSearch() method.
Update AiVdbProviderInterface::vectorSearch() to accept VdbSimilarityMetrics $metric_type as a param. This will require that implementing providers update their vectorSearch method signatures.
[3486166-pass-metric-type]
Closes #3486166